I have an almost new Makita HP1640 corded hammer drill. After a couple hours use in Hammer drill mode, I can't slide the lever back to the normal drilling mode. Is there a trick I need to use? Or is it just plain defective? I expected better from Makita.

Here is the parts breakdown of your drill. It is hard to say exactly what is the problem, but #10, #13, and #17 have to do with the hammer action. #15 is the hammer switch. It also could be bad. good luck on that. https://www.ereplacementparts.com/makita-hp1640-5834-hammer-drill-parts-c-97_16247_40066.html

134527-9 http://www.ereplacementparts.com/torque-limiter-assembly-p-54984.html?osCsid=h08big45jse6abdn6tcftrcnt6


How is the healt of this piece is it worn also the other part that will work together with this part must be replaced

Or hows the part connexion 221347-1 spiral bevel gear on the 152335-6 cilinder liner ?? i think its economic not interesting for repair because of the high prices. and the problem of discontinued parts in the prospect

Grip a large Allen key in chuck then use a thin spanner wrench on spindle below chuck to loosen.

Yes, just make sure it is the same fitting as your old one.

The big control levers off, but the small one only comes off once you have removed the screw and have it in the down position.

It could be the pin in the lever on the side or a fault in the g/box. You don't say what model it is.

Hello. Here is the link to the parts breakdown (PDF file centre left) that should provide the reference you need. There is also a PDF for the owners manual if needed. Hope this helps.

Hello,
Try rotating the chuck to a different position, and trying it again. If it catches "between gears", it won't shift.
Best regards, --W/D--

Sounds like the chuck is worn, happens frequently when used often. Here's the link to Makita, their contact info should get you some answers as to what part number is needed as well as the closest location to you for service if required. Hope this helps.

http://www.makita.com/en-us/Modules/Tools/ToolDetails.aspx?ID=316372

Exchanged Makita HP1640 hammer drill for a new one. The 2nd drill did the same thing in under an hour!! Will return for refund. Instructions say the Forward/Reverse switch must be in a full up or down position for the Hammer/Rotary switch to move; well, it is and the Hammer/Rotary switch still stops at a 1/2 way point between modes. Although I can still use the drill, instruction warnings say not to because it may potentially burn out the motor. I'll have to go with a different brand this 3rd time around. It seems to be a design flaw.